#12642: fix args names in open() doc.
diff --git a/Doc/library/functions.rst b/Doc/library/functions.rst
index c372d7d..635b465 100644
--- a/Doc/library/functions.rst
+++ b/Doc/library/functions.rst
@@ -796,7 +796,7 @@
Formerly only returned an unsigned literal.
-.. function:: open(filename[, mode[, bufsize]])
+.. function:: open(name[, mode[, buffering]])
Open a file, returning an object of the :class:`file` type described in
section :ref:`bltin-file-objects`. If the file cannot be opened,
@@ -804,7 +804,7 @@
:func:`open` instead of invoking the :class:`file` constructor directly.
The first two arguments are the same as for ``stdio``'s :cfunc:`fopen`:
- *filename* is the file name to be opened, and *mode* is a string indicating how
+ *name* is the file name to be opened, and *mode* is a string indicating how
the file is to be opened.
The most commonly-used values of *mode* are ``'r'`` for reading, ``'w'`` for
@@ -825,9 +825,9 @@
single: buffer size, I/O
single: I/O control; buffering
- The optional *bufsize* argument specifies the file's desired buffer size: 0
+ The optional *buffering* argument specifies the file's desired buffer size: 0
means unbuffered, 1 means line buffered, any other positive value means use a
- buffer of (approximately) that size. A negative *bufsize* means to use the
+ buffer of (approximately) that size. A negative *buffering* means to use the
system default, which is usually line buffered for tty devices and fully
buffered for other files. If omitted, the system default is used. [#]_